$count: 200;

html,
body {
  height: 100%;
  background: #000;
  overflow: hidden;
  margin: 0;
}

.g-candle {
  position: absolute;
  width: 400px;
  height: 400px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

// 绘制蜡烛
.g-body {
  position: relative;
  width: 100px;
  height: 300px;
  margin: 280px auto;
  background: linear-gradient(230deg, #ca9800, #573903, black 70%);
  z-index: 1;

  // 顶部的盖
  &::before {
    position: absolute;
    content: "";
    width: 100px;
    height: 40px;
    border-radius: 50%;
    box-sizing: border-box;
    top: -20px;
    background: radial-gradient(#a46800, #5c3104 45%, #905602 100%);
  }

  // 灯芯
  &::after {
    position: absolute;
    content: "";
    width: 4px;
    height: 48px;
    background: #fff;
    left: 50%;
    top: -22px;
    transform: translate(-50%, -50%);
    border-radius: 50% 50% 0 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, .3) 0%, rgba(0, 0, 0, .8) 60%, #fff);
    opacity: .7;
    filter: blur(1px);
  }
}

// 绘制火焰
// 让200个div以特定的形状以动画的形式往上动来模拟实现一个火焰燃烧的效果
.g-fire-box {
  position: absolute;
  top: 97px;
  left: 50%;
  width: 80px;
  height: 200px;
  transform: translate(-50%, -50%);
  filter: blur(2px) contrast(20);
}

.g-fire {
  position: absolute;
  top: 30px;
  left: 50%;
  border-radius: 45%;
  box-sizing: border-box;
  border: 120px solid #000;
  border-bottom: 120px solid transparent;
  transform: translate(-50%, 0) scaleX(.45);
  background-color: #761b00;
}

.g-ball {
  position: absolute;
  top: 60px;
  transform: translate(0, 0);
  background: #fa8763;
  border-radius: 50%;
  z-index: -1;
  // mix-blend-mode CSS 属性描述了元素的内容应该与元素的直系父元素的内容和元素的背景如何混合。
  mix-blend-mode: screen;
}

@for $i from 0 to $count {
  .g-ball:nth-child(#{$i}) {
    $width: #{random(50)}px;

    width: $width;
    height: $width;
    left: calc(#{(random(70))}px - 55px);
  }

  .g-ball:nth-child(#{$i}) {
    animation: movetop 1s linear -#{random(3000)/1000}s infinite;
  }

}

@keyframes movetop {
  0% {
    transform: translate(0, 0);
  }

  20% {
    transform: translate(0, 0);
  }

  87.7% {
    transform: translate(0, -170px);
    opacity: 0;
  }

  100% {
    transform: translate(0, -170px);
    opacity: 0;
  }
}